How does ip6 filing structure work ie. roll & data folders organization?

Question

Can someone explain how ip6 folders/structure is layed out? When I import an image from the file/import to library what happens..? I did some house cleaning in my pics and after looking thur the structure of folders found some empty folders (in the iPhoto Library-Data-2006 ) roll xxx. Can I delete these folders? Can I group some contents that have only one img file with others to make a larger content folder? I don't want to be anal but, it seems quite wasteful to not be able to put like stuff in the same folder..
Mark

Answer 1

Terence explained:
iphoto makes a jpeg copy of the RAW file, so that all
your editing is done on the jpeg and your RAW is
preserved intact. This is default iphoto behaviour
and can't be changed.
Different on mine. iPhoto normally makes two copies of the original, even on the vast majority of pictures which I don't edit (of course, for those which I do edit an extra copy is required). So normally, to use iPhot I have to carry around either two or three copies of pictures I wish to use or share.
But sometimes it is otherwise. I've somehow got a "Drop box" folder in my 'Pictures' folder, which holds a cascade of iPhoto-like folders (e.g. 2006->07->05) in which there are single files, which display in iPhoto, but have no duplicates (at least, according to the 'Find" command). Two zero-size files with the same name are found in iPhoto, each seemingly referring to a sub-folder reference. But the point is, the file shows in iPhoto, but there is only one copy of it. So seemingly it can be done!
If space is getting tight I suggest getting a
firewire drive and moving your iPhoto library to it.
I already have a couple of these, but as one who actually uses his PowerBook to carry around and burn his knees with, I have to say that plugging up an external drive rather takes the spontaneity out of sharing a photograph with a friend or a co-worker!
Internal drives are getting bigger, but they are costlier than externals. One also has to take one's courage in both hands (or one's wallet!) when it comes to changing them over. Took me 4 nerve-wracking hours last time. Costs $160 hereabouts to have some one do it for you.
12" PowerBook G$ 1.5 GHz Mac OS X (10.4.8) iPhoto 6.0.5
12" PoerBook G4 1.5 GHz Mac OS X (10.4.8)